• Journal of Sensor Science and Technology
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• v.12 no.5
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• pp.211-217
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• 2003

This paper is proposed that roadway recognition performance improvement for autonomous vehicle using magnetic markers that are embedded along the road center and the sensors mounted on a vehicle, and which changing of magnetic field that is measured along with vehicle driving. For Retrenchment of equipment cost, interval of markers is more expensive than existing method. In order to this, This paper is proposed that interval of markers is founded using magnetic field analysis, and which arrangement method of six magnetic sensors and control method of neural network. This paper is carried out magnetic field analysis, the acquiring of the training patterns, the training of the neural network and composition of steering control, and is verified that roadway recognition performance can improve using computer simulation with proposed methods.

• Journal of Biomedical Engineering Research
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• v.18 no.4
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• pp.421-428
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• 1997

Magnetic field sensors made from superconducting quantum interference device (SQUID) are the most sensitive low-frequency sensors available, enabling measurements of extremely weak magnetic fields from the brain. Neuromagnetic measurements allow superior spatial resolution, compared with the present electric measurements, and superior temporal resolution, compared with the fMRl and PET, providing useful informations for the functional diagnoses of the brain. We developed a 4-channel SQUID system for neuromagnetic applications. The main features of the system are its simple readout electronics and compact pickup coil structure. A magnetically shielded room has been constructed for the reduction of environmental magnetic noises. The developed SQUID system has noise level lower than the magnetic noise from the brain. Magnetic field signals of the spontaneous r-rhythm activity and auditory evoked magnetic fields have been measured.

• Journal of the Korean Magnetics Society
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• v.26 no.4
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• pp.133-136
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• 2016

In this study, we have constructed a measuring system to investigate tensile stress of tendons, which is employed in bridges, by means of the magnetic non-destructive testing (NDT) method. For the twisted 7-strands tendon, we have used Wiedemann effect. An ac current was applied to the tendon and voltage induced from Search Coil on Tendon (SCT) under applying tensile stress was measured. The measuring system consists of tensile stress applying apparatus up to 2 GPa, and ac current supply to apply current to the tendon directly to magnetize the tendon. We have invested two kinds of tendon which were produced by different companies for testing with constructed measuring system. Voltage induced from SCT was decreased up to 1.5 GPa linearly and two kinds of tendon which were produced by different companies shows similar trends. Thus, Wiedemann effect was also applicable to measure tensile stress of tendon by means of magnetic NDT.

• Electrical & Electronic Materials
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• v.7 no.2
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• pp.165-175
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• 1994

1967년 Wegener등과 Khang등이 각각 구조 및 동작원리가 다른 비휘발성 반도체 메모리(nonvolatile semiconductor memory)를 최초로 개발, 도입한 이후 3세대째를 보내고 있는 현재, 메모리는 반도체산업의 선봉으로써 여전히 공정기술(processing technology)을 이끌며, 시장점유율, 응용범위등에서 주도적 위치를 차지하고 있다. 한편, 최근의 컴퓨터 시스템은 소형화, 저전력화, 고속화, 내충격성 등 기술적 측면에서 뿐만 아니라 소프트웨어적으로도 급격히 발전하고 있다. 이에 따라 메모리부분에 있어서도 기존의 자기 하드디스크 메모리(magnetic hard disk memory)의 한계를 극복하기 위해서 반도체 메모리로서 대체가 더욱 요구되고 있다. 이와같은 상황에서 EEPROM(electrically erasable and programmable ROM)은 상주 시스템내에서도 전기적 방법에 의해 사용자가 임으로 기록/소거(write/erase)할 수 있을 뿐만 아니라 전원이 제거된 상테에서도 기억상태를 유지할 수 있는 비휘발성이라는 점에서 차세대 반도체 메모리 부문의 주역으로서 주목받고 있다. 따라서, 본 고에서는 20세기를 보내며 반도체메모리의 새로운 장을 열어가는 EEPROM의 기술현황 및 전망에 관해 살펴보고자 한다.

• The Journal of the Korea Contents Association
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• v.20 no.6
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• pp.439-444
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• 2020

The purpose of this study is to seek an alternative method to prevent the contamination of normal saline caused by the back-flow of Gadolinium Based Contrast Agent(GBCA) by the use of auto-injector for dynamic MRI. The research method is to manufacture the non-return valve as an alternative to the existing, and to examine the usefulness of the normal saline by dividing the state of normal saline into three groups. The signal intensity were compared. As a result, there was no statistically significant difference between normal saline before injection of group 1 and group 3 non-return valve (p> 0.05). It is analyzed that the self-produced non-return valve completely blocked the GBCA back to normal saline when the GBCA was injected. In conclusion, the application of the non-return valve presented in this study for dynamic MRI imaging using the auto injector can prevent normal saline contamination due to GBCA back-flow.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.3
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• pp.55-65
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• 2004

When a neural network is used to solve a given problem it is necessary to match the complexity of the network to that of the problem because the complexity of the network significantly affects its learning capability and generalization performance. Thus, it is desirable to have an algorithm that can find appropriate network structures in a self-organizing way. This paper proposes algorithms which automatically organize feed forward multi-layer neural networks with sigmoid hidden neurons for given problems. Using both constructive procedures and pruning procedures, the proposed algorithms try to find the near optimal network, which is compact and shows good generalization performance. The performances of the proposed algorithms are tested on four function regression problems. The results demonstrate that our algorithms successfully generate near-optimal networks in comparison with the previous method and the neural networks of fixed topology.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.11a
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• pp.28-28
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• 2008

Generally speaking, Rogowskii coil for magnetic flux change detection according to electric current is used for digital addition watt-hour meter, because it is not saturated at electromagnetic that not Current Transformer working by magnetic material but non-magnetic material. In this paper, we described sensitive quality an electric current coil sensor followed by the principal of Rogowskii coil on the low dielectric loss LTCC, change different line width, gap, line length at sensing parts and extinction parts.

• Journal of Korean Society for Geospatial Information Science
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• v.4 no.2 s.8
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• pp.79-90
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• 1996

It is well known that point positioning using a C/A-code receiver is severely biased by errors in pseudorange. This paper shows the procedures of quantitive analysis for several error elements and that some methods to monitor SA(selective availability) of witch process is not opened are proposed. It is possible to verify the effects of SA in the Doppler shift and receiver clock drift variation. Easy methods to reduce SA effects are to fit second order polynomials for the one and a linear function for the other. With periodic autocorrelation functions. SA effects are analyzed and first order Gauss-Markov process parameters are decided.

• Journal of Korean Classical Literature and Education
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• no.37
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• pp.151-184
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• 2018

The purpose of therapeutic approach of humanities, including literary therapy, is ultimately encourage the growth and the development of human being rather than the development of therapeutic techniques for eradicating symptoms. This paper is noteworthy as to the fundamental work for using folktales at therapy sessions. It may be argued that therapy is the process of searching clients' own development history and accepting current challenges in relation to overall context of their own lives and this may lead to the growth clients. In this regard, this paper attempts to set up the selection criteria for folktales to be effectively applied in therapy sessions. The author of the paper argued in her previous paper that folktales may be effective in terms of self-understanding of clients. Folktales can assist clients regarding the objectification of their issues by projecting and exposing their problems. Therefore, this paper argues the method for selecting proper folktales to stimulate of clients" developmental challenges and ultimately to expose them. The first groundwork for this is understand contents of folktale as to general problems of life and view it as the development of one's entire life. The challenge of client is personal and unique but at the same time it is problems of general development process. The author examines the need for developmental approach of literary therapy and attempts to compose a classification framework for understanding folktales as to developmental process. This may use at literary therapy sessions to select proper folktales based on clients' complaining issues and their developmental age. The criteria also can be used as the basis of clients" reaction on folk-tales.

• Journal of Digital Convergence
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• v.12 no.10
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• pp.385-390
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• 2014

This research is conducted to identify whether an m-DIXON technique which is useful for an abdomen MRI examination compared with an existing e-THRIVE technique is a clinically useful or not. There was evaluated quantitative and qualitative to 84 subjects who had abdomen MRI exam due to their liver disease were conducted during a period from September in 2013 to February in 2014. First of all the quantitative evaluation, the m-DIXON technique's SNR was $90.42{\pm}16.90$ and the e-THRIVE technique was $60.42{\pm}11.54$ and the m-DIXON technique's CNR was $52.38{\pm}22.58$ and the e-THRIVE technique was $46.31{\pm}20.25$. Secondly in the qualitative evaluation, the m-DIXON technique's image quality was $4.06{\pm}0.34$, a artifact was $3.64{\pm}0.22$, and fat suppression was $4.16{\pm}0.15$, the e-THRIVE technique's image quality was $3.14{\pm}0.35$, a artifact was $3.06{\pm}0.38$, fat suppression was $3.14{\pm}0.30$. In conclusion, m-DIXON technique for abdomen MRI examination showed superiority over both SNR as a quantitative anaylsis, CNR and a qualitative analysis.